Boling didn't intend to kill his friend and one-time roommate, he told detectives, until he found a length of pipe nearby.

When he finally told Lubbock County sheriff’s investigators he beat Russell McKinney, Allen Lee Boling said he didn’t plan to kill the man who’d been his friend and one-time roommate.

Things changed when Boling found a length of pipe in the bedroom where McKinney lay sleeping.

“I picked up the pipe and started whupping his --- with it,” Boling told investigators Anthony Castillo and Jason Stewart in a video played for jurors in Boling’s capital murder trial Wednesday.

And later in the day, an expert from the Department of Public Safety’s Lubbock crime laboratory testified DNA in a bloodstain on the pipe was a match for McKinney, as was DNA in a bloodstain on a rag investigators believe was used to wipe down the pipe afterward.

Naomi McDonald testified the lone stain on the pipe contained a mixture of DNA and said, “McKinney was the source of the major component.”

She also testified bloodstains on Boling’s T-shirt also contained genetic material from two contributors, adding McKinney’s DNA was the major component.

The smaller component was insufficient for testing, she said.

The jury got its first look at much of the case’s physical evidence Wednesday, ranging from suspects’ clothing to a bent length of pipe believed to be the weapon.

A photograph was shown to the jury during the testimony of Robby Holbert, crime scene investigator for the Lubbock County Sheriff’s Office, who showed the pipe alongside a tape measure, indicating the pipe was nearly 5 feet long.

Holbert described it as galvanized pipe.

The prosecution is scheduled to resume its case this morning at 9 a.m. before Judge Cecil Puryear.

Castillo and Stewart arrested Boling during a search of the trailer where he lived from time to time with a woman.

The woman’s daughter accused McKinney of raping her about a week before the fatal beating on Jan. 19, 2011.

Stewart, on the witness stand for much of the morning, testified Castillo found Boling hiding in a bedroom closet of the trailer.

In the video played for the jury, the two investigators questioned Boling sporadically for more than 90 minutes.

Boling’s answers changed from flat denials he’d been involved in the attack — “I wasn’t there” — to describing how he tried two doors before finding the unlocked back door to McKinney’s trailer, going to the victim’s bedroom, beating the sleeping man, and leaving by the front door.

He began to change when Castillo and Stewart told Boling other people involved in the case were giving their version of events, and he would be wise to put his story on the record.

In the video, Boling does not ask for a lawyer during questioning.

“I didn’t want to kill him. I wanted to hurt him so he’d never do that again,” Boling told the investigators, as he recounted the night more than a year ago.

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CSI: Lubbock

The jury in the Allen Lee Boling murder trial got a long look at how crime scene investigations work at the Lubbock County Sheriff’s Office.

They found out it’s a slow and painstaking process of photographing the scene, collecting and bagging evidence, running some tests in-house and sending other items out to the Department of Public Safety’s regional crime lab.

Investigator Robby Holbert, who handled the crime scene investigation for the case, laid the foundation for later testimony by DPS lab analyst Naomi McDonald by explaining how evidence is collected and how decisions are made with other detectives to determine what will be sent out for laboratory tests.

And not everything that goes to the crime lab gets tested.

For example, Lubbock Country sheriff’s investigators sent the jeans Boling was wearing to the DPS crime lab along with his T-shirt. McDonald said the small blood stains on the jeans tested presumptively as blood, but a decision was made to not run a DNA test because they’d already tested Boling’s shirt and found victim Russell McKinney’s DNA in the sample.